Browse Prior Art Database

Tractive Magnet Hole Reader

IP.com Disclosure Number: IPCOM000090325D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Dombrowski, JP: AUTHOR [+2]

Abstract

The static punch card reader employs an iron yoke capped with an apertured metal guide plate made from a low carbon steel or other magnetic conductive material. A plurality of magnetic conductive actuating pins, one for each hole position, is captured in the assembly by a spring and a plastic or other nonconductive plate. The elastic diaphragm switch matrix having contact points in registration with the actuators is mounted on the yoke. When a document is to be read, it is placed in position over the switch matrix and the coil is energized. This establishes flux paths through the pins which cause the pins to move against the forces exerted by the retaining springs. Those pins in registration with punched holes in the inserted document actuate the contacts in the switch matrix to indicate the locations of the punched holes.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Tractive Magnet Hole Reader

The static punch card reader employs an iron yoke capped with an apertured metal guide plate made from a low carbon steel or other magnetic conductive material. A plurality of magnetic conductive actuating pins, one for each hole position, is captured in the assembly by a spring and a plastic or other nonconductive plate. The elastic diaphragm switch matrix having contact points in registration with the actuators is mounted on the yoke. When a document is to be read, it is placed in position over the switch matrix and the coil is energized. This establishes flux paths through the pins which cause the pins to move against the forces exerted by the retaining springs. Those pins in registration with punched holes in the inserted document actuate the contacts in the switch matrix to indicate the locations of the punched holes. The remaining pins are retained by the unpunched portions of the document. When power to the coil is removed, the retaining springs restore all pins thus permitting removal of the document.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]